GeekVape Baron RDA, with 24mm diameter, constructed of stainless steel, comes with both standard 510 and BF squonk 510 pin, which enables it to be compatible with both regular mods and squonk mods. And Baron features airflow cover with retaining ring and multifunction airflow chimney: long stripes airholes and mesh type airholes for adjustable airflow control system. The Baron RDA also are compatible with Squonk mods by Bottom Feeder Pin.